About UNS S31254 Seamless and Welded Pipes (254 SMO, 1.4547, 254SMO)
UNS S31254, also known as Alloy 6Mo, WNR 1.4547, F44, or 254SMO, is a high-performance super austenitic Stainless Steel designed for extreme corrosion resistance. It excels in harsh environments such as high-temperature seawater, chemical processing, and flue gas desulfurization systems.
We offer a wide range of seamless and welded stainless steel pipes made from premium-quality materials. These S31254 pipes are ideal for use in seawater treatment, desalination plants, and other demanding industrial applications. Each product is manufactured to meet strict international standards, ensuring durability and performance under the most challenging conditions.
Key features of UNS S31254 stainless steel pipes include:
- High Corrosion Resistance: Excellent performance in chloride-rich and acidic environments.
- High Strength: Offers superior mechanical strength, making it suitable for heavy-duty applications.
- Excellent Weldability: Easy to weld and fabricate, allowing for flexible design and installation.
- Compliance with Standards: Meets ASTM A269, ASTM A312, and ASTM A213, ensuring quality and reliability.
The manufacturing process begins with melting the alloy in an electric arc furnace, followed by refining using an argon-oxygen decarburization (AOD) process. This helps remove impurities like carbon and sulfur. The refined material is then cast into a billet and hot-rolled into tubes, ensuring consistent quality and structural integrity.
SMO 254 Seamless Pipe Specifications
| Specifications | ASTM A 409 / ASME SA 409, ASTM A 312 / ASME SA 312, ASTM A 358 / ASME SA 358 |
| Dimensions | ASTM, ASME, API |
| Size | 1/2†– 48†|
| Specialized in | Large Diameter Sizes |
| Thickness | 20 SWG, 18 SWG, 16 SWG, 14 SWG, 12 SWG, 10 SWG, Sch. 10, Sch. 40, Sch. 80 |
| Type | Seamless, ERW, Welded, Fabricated |
| Form | Round, Hydraulic, etc. |
| Length | Single Random, Double Random, Cut Length |
| End | Plain End, Beveled End, Threaded |
SMO 254 Pipe Chemical Composition
| SMO 254 | Ni | C | Mo | Mn | Si | Fe | Cu | S | P | Cr |
| 17.5–18.5 | 0.02 max | 6–6.5 | 1 max | 0.8 max | – | 0.5–1 | 0.01 max | 0.03 max | 19.5–20.5 |
SMO 254 Pipe Mechanical Properties
| Density | Melting Point | Yield Strength (0.2% Offset) | Tensile Strength | Elongation |
| 8.0 g/cm³ | 1320–1390 ℃ | 300 MPa | 650 MPa | 35 % |
Equivalent Grades for 254 SMO Pipe
| STANDARD | UNS | WERKSTOFF NR. | AFNOR | EN | JIS | SIS | GOST |
| SMO 254 | S31254 | 1.4547 | Z1 CNDU 20.18.06Az | X1CrNiMoCuN20-18-7 | – | 2378 | – |
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Suzhou Yuhaoxuan Electromechanical Co., Ltd , https://www.essiont-pipeline.com